exam Maths Puzzle Numerical Ability

(rad)x-1)=x-3 i know I square them first but then i get lost. please help me.

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exam Other Question

IF IT TAKES SALLY 4 HOURS TO PAINT A HOUSE AND IT TAKES JOHN 6 HOURS TO PAINT THE SAME HOUSE, HOW LONG WOULD IT TAKE THEM TO PAINT THE SAME HOUSE TOGETHER.

ANSWER: 2 HOURS AND 24 MINUTES Can some one help me solve this problem?
Suppose instead that the town experiences growth that can be modeled by the following:
P=1000 squareroot t+ P, WHERE T IS THE NUMBER OF